Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lua tre » cua tre, dua tren, luat tri
luy tre » luyen tre
qua cam » qua cham, qua cac, qua ca
nang ma » tang ma, sang ma, nang cao
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu qua cam ((tuc va) OR (thuc day)) hanh vi ((lua tre) OR (luy tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu qua cam ((tuc va) or (thuc day)) hanh vi ((lua tre) OR (luy tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu qua cam ((tuc va) or (thuc day)) hanh vi ((lua tre) OR (luy tre))*.